Friction-clutch.



BATENTED MAR. 20, 1 906.

V T. C. DEXTER.

FRICTION CLUTCH.

,APPLlOATION 21mm AUG.29,1905.

2 SHEETS'SHEET 1.

Smwtom PATENTED MAR. 20, 1906.

T. GQDEXTER. FRICTION GLUTGH.' Argmcumu FILED AUG. 29,1905.

l 2 SHEETS-SHEET 2.

UNITED STATES PATENT. OFFICE. v I

TALBOT U. DEXTER, OF PEARL .RIVER, NEW YORK.

FRlCT|ONj-CLUTCH- Specification of Letters Patent.

Patented March. 20, 1906;

Applicatioufil'ed August 29 1905. Serial No. 276,286.

To a whom it may concern; .Be it known that I, TALBOT O. DEXTER, a

. citizen of the United States, residing at Pearl use, but is of muchwider application, since it is conveniently applicable to all mechanismsin connection with which friction-clutches are used.

' My improved friction-clutch is of the type which embodies afriction-wheel member and an adjustable friction-band, and the noveltyin my improved clutch lies in the construction and arrangement of thedevices for adjusting the band member upon the friction-' wheel memberand for maintaining'the band member in the desiredadjusted positiondur-' ing operation.

Surrounding the frictional wheel member of my improved clutch is a drumformed with aninternal radial recess or pocket, and interposed betweenthe fri'ction-wheel and drum is a s lit band whose ends project intosaid radia recess or pocket and are engagedon their inwardly-projectingfaces by an adjustable wedge-shaped block and upon theiroutwardly-presented face by adjustable screws or bolts, the wedge-shapedblock resting between the ends of the split band within the recess orocket of thedrurn and being bodily movab e in aplane parallel with theaxis of rotation of the clutch, a threaded bolt i projecting from theblock through an open ing in the end wall of the drum to receive anadjusting-nut which engages the end wall of Ithe drum. The adjustingscrews or bolts through suitable bosses formed on the drum I whichengage the outwardly-presented faces of the ends of the split band arethreaded and extend tangentially with relation to the clutch. A strap orweb of leather or other suitable frictional material is preferablyinterposed between the rim of the. frictionwheel-and the split band Byadjusting the I 'wedgesha ed block and screws or bolts the friction ho dof the clutch can be adjusted to a nicety.

In order that my invention may be fully understood, I will firstdescribe the same with reference to the accompanying drawings, andafterward point out the novelty more particularly in the annexed claims.

. In saiddrawings, Figurel is a detail side elevation of part of apaper-cutting machine of the type shown in my above-named application,illustrating my improved frictionclutch. Fig. 2 is a detail insldeelevation of a part of the improved clutch. Fig. 3 is a verticaltransverse sectional elevation of the clutch looking from the inside of.the machine as illustrated-in Fig. 1. Fig. 4 is an edge view of thesame, parts being in section on the line w w of Fig. 3 and part beingbroken away. Fig. 5 is a detail perspective view of the adjustablewedge-shaped block.

1 is a part of the side frame of a paper-cutting machine.

- 2 is a transverse clamp-shaft suitably journaled in the side frame andcarrying adjacent to its opposite ends pinions (indicated in dottedlines at 3) which mesh with rack-bars, (indicated in dotted lines at 4,)which rackbars are suitably connected with the clamp of thepaper-cutting machine.

-5 is a crank-shaft suitably j ournaled in the machine-frame and drivenin any suitable manner such, for instance, as shown in my above-namedapplication. The crank-shaft carries a crank 6, which is connected,through a pitman 7, with my improved clutch, which is mounted uponclamp-operating shaft 2 and will now be described in detail. 10 is afriction-wheel member. of my improved clutch, said wheel member beingrigidly keyed to shaft 2, as shown. The wheel member 10 carries anintegral stoplug orv projection 11, which is adapted to engage a part lupon the machine-frame for limiting the return movement of the wheel 10when the clamping-bar is returned to its inactive raised position.

Inclosing the friction-wheel 10 is a drum internal radial recess orpocket 17 arranged between the lugs or bosses 16. The lugs or bosses 16are bored tangentially of the frictionwheel and threaded to receive thetangential adjusting screws or bolts 18, whose inner ends project intothe recess or pocket 17 for the purpose which will presently appear.

Supported within the drum is' an expansible split steel band 20, whoseadjacent ends are formed with outwardly-projecting flanges 21, whichrest within the recess or pocket 17 of the drum, the outer faces of'these flanges (forming the ends of the split band) being engaged by theinner ends of the screws or bolts 18. The inwardly-presented faces ofthe flanges 21 are oppositely inclined or beveled transversely to theflanges or to a plane parallel with the shaft 2, as indicated at 21.

25 is a wedge-shaped block resting within the recess or pocket 17between the inclined or beveled faces 21 of the flanges 21, the in,-clination of the engaging face of the wedge 25 being approximately ofthe same degree as the inclination of faces 21 Secured to the small endof the wedge 25 is a threaded bolt 26, which projects out through a slotor opening 27 in the end wall of the drum 15, said bolt 26 extendingparallel with the shaft 2. An adjusting-nut 28 is threaded upon the bolt26 and engages the end wall of drum 15 for securing the wedge 25 indesired adjusted position and for moving it in one direction.

Interposed between the inner face of the split band 20 and the rim offriction-wheel 10 is a strap or web of leather or other suitablefrictional material, as shown at 30, the ends of this strap or webcoinciding approximately with the ends of the split band 20.

The inner open end of the drum 15 is closed by the circular plate 35,secured to the rim of the drum 15 by screws 36. This plate is formedwith a central opening 37, which fits loosely over the hub offriction-wheel 10, and a concentric segmental slot 38, through which thestop-lug 11 projects and in which said lug may operate to allow relativemovement between the friction-wheel and drum at the ends of themovements of the clutch.

Projecting from the end wall of the drum 15 is a journal-stud 10,rigidly braced upon the drum, the upper end of the pitman 7 beingjournaled upon the said stud to connect drum 15 of the clutch with thecrank 6 of the shaft 5.

When it is desired to contract the band 20 to tighten it upon the rim ofthe frictional wheel 10 to increase the frictional hold of the clutch,the nut 28 is screwed outwardly and the wedge 25 forced inwardly by aslight blow on the end of the bolt 26, the bolts 18 being then screwedinwardly to force the inclined faces of lugs 21 into engagement with thewedge 25. To expand the band 20 for lessening the frictional hold of theclutch, the reverse operation is performedthat is, the bolts 18 arescrewed outwardly and the nut 28 is tightened upon bolt 26 to draw thewedge 25 outward. The operation of the clutch in its application to thepaper-cutting machine, shown in my above-named application, Serial No.246,139, will be clear with but a few words of explanat on. The shaft 5rotating in the direction indicated by the arrow imparts motion to theclutch, the drum 15 driving the wheel 10 through the frictional hold ofthe band 20. The parts of the clutch will rotate together until theclamping-bar of the paper-cutter engages the pile of sheets with therequired pressure, when the frictional hold of the clutch. will beovercome and allow the drum 15 and split band 20 to rotate upon thefriction-wheel 10 until the end of the half-revolution of the crank 6 isreached. In the return movement the clutched parts move back togetheruntil the stop-lug 11 arrests the drive-wheel 10, when the drum 15 andband 20 will again slip upon the drive-wheel until the crank 6 reachesthe end of its second half-revolution.

My improved clutch is of simple and powerful construction and can bereadily adjusted to the desired frictional hold.

Having thus described my invention, the following is what I claim as newtherein and. desire to secure by Letters Patent:

1. A friction-clutch comprising a frictionwheel, a split friction-bandencircling the friction-wheel, a wedge supported between the ends of thesplit band, and means engaging the ends of the band in opposition to thewedge.

2, A friction-clutch comprising a frictionwheel, a split friction-bandencircling the friction-wheel, a wedge supported between the ends of thesplit band, means for ad justing the wedge for expanding the band andfor allowing the contraction of the band, and adjustable means engagingthe ends of the split band in opposition to the wedge for contractingthe band and securing the ends of the band against the wedge.

3. A friction-clutch, comprising a frictionwheel, a split friction-bandencircling the friction-wheel and formed with lugs or flanges at itsends, an adjustable wedge supported between the said lugs or flanges andmeans engaging said lugs or flanges in opposition to the wedge.

4. A friction-clutch, comprising a frictionwheel, a drum encircling thefriction-wheel, a split friction-band inclosed between the wheel anddrum, a wedge supported between the ends of the said split band, meansfor adjusting said wedge, and means engaging the ends of the split bandin opposition to the wedge.

5. A friction-clutch, comprising a driven member, a driving memberencircling the driven member, a split friction-band. inclosed betweenthe driven and driving members, said split band havingradially-projecting lugs or flanges at its ends, a wedge movablysupported between the said lugs or flanges, means for adjusting saidwedge transversely and drum and provided with outwardlypro-- jectinglugsor flanges, inclined inwardlypresented faces formed upon said lugsor flanges, a wedge-shaped block supported be tween the lugs or flangesin engagement with said inclined faces, means for adjusting said block,and means for confinin the lugs or flanges in engagement with the flock.

7. A friction-clutch, comprising a frictionwheel, a drum surroundingsaid wheel, a split friction-band interposed between the wheel and drumand provided with lugs or flanges projecting approximately radial to thefriction-wheel, the inwardly-presented faces of said lugs or flangesbeing inclined transversely thereof, a wedge-shaped block supportedbetween the lugs or flanges in engagement with said inclined faces,means for ad usting said block transversely of the lugs or flanges, andmeans for confinin thelugs orflanges in engagement with the b ock.

8. A friction-clutch, comprisin a frictionwheel, a drum surroundin saidw eel, a split friction-band interposed etween the wheel and drum andprovided with outwardly-proj ecting lugs or flanges, a wedge-shapedblock between the lugs or flanges and movable bodilytransverselythereof, means for ad justing said block, and means forconfining the lugs or flanges in vengagement with the block.

9. A sli friction-clutch, comprising a friction-whee, an oscillatorydriving-drum encircling the friction-wheel, a split frictionbandinclosed between the wheel and drum, a wedge supported between the endsof the split band, means for adjusting the wedge, means engaging theends of the split band in opposition to the wedge, and means foroperating the drum. f 10. A slip frictionclutch, comprising a drivenfriction-wheel, an oscillatory drivingdrum encircling thefriction-wheel, a spl1t friction-band inclosed between the wheel anddrum and provided with radially-projecting lugs or flanges 'at its ends,a wedge movably supported between said lugs or flan es, means foradjusting said wedge, adjusta le means engaging said lugs or flanges inopposition to said wedge, and operating'means for oscillating the drum.4 s

11., A slip friction-clutch comprising a driven, friction-wheel, adrivingdrum surrounding said Wheel and formed with a radial recess orpocket, a split friction-band interposed between the wheel and drum andformed with lugs or flanges which project into said recess or pocket ofthe drum, a wedgeshaped block supported between said lugs or flanges, ascrew for adjusting the said block, screws seated in the drum andengaging the outer faces of said lugs or flanges in opposition to thesaid wedge, and operating means including a rotary crank and a pitmanfor oscillating' saiddrivmg-drum.

12. A friction-clutchcomprising a wheelshaped member, a drum-shapedmember surroundin' the wheelshaped member, a split frictionand withinthe drum formed with outwardly-projecting lugs or flanges, frictionmaterial interposed between the split band and the wheel-shaped member,a wedge-' shaped block, supported between the adjacent faces of saidlugs or flanges, a screw for adjusting said block, and screws seated inthe drumand engaging the outer faces of said lugs or flanges.

13. A friction-clutch, comprising africtionwheel, a drum surrounding thefriction-wheel and formed with a radial recess or pocket, a splitfriction-band within the drum formed with outwardlyprojecting lugs orflanges, which rest in said recess or pocket, a wedgesha ed blocksupported in said recess or poc et between the adjacent faces of saidlugs or flanges, a screw for adjusting said block, and tangential screwsseated in the drum and projecting into said recess orpocket in engaement with the outer faces of said lugsor anges.

14. A friction-clutch, comprising africtionwheel, a concentric drumsurrounding the friction-wheel, and formed with a radial recess orpocket, a split friction-band within the drum formed withoutwardly-projecting- -lugs or flanges which rest in said recess orpocket, a wedge-shaped block supported in said recess or pocket betweenthe adjacent faces of said'lugs or flanges, a screw-bolt pro- TALBOT o.DEXTER.

Witnesses:

G. V. B. LERTOH, V. E. MARSH.

IIO

